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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.car.media;
     17 
     18 import android.content.Context;
     19 import android.graphics.Bitmap;
     20 import android.graphics.Color;
     21 import android.graphics.ColorFilter;
     22 import android.graphics.ColorMatrix;
     23 import android.graphics.ColorMatrixColorFilter;
     24 import android.support.car.ui.AnimationListenerAdapter;
     25 import android.support.car.ui.LogDecelerateInterpolator;
     26 import android.util.AttributeSet;
     27 import android.view.View;
     28 import android.view.ViewGroup;
     29 import android.view.animation.Animation;
     30 import android.view.animation.AnimationUtils;
     31 import android.widget.FrameLayout;
     32 import android.widget.ImageView;
     33 
     34 /**
     35  * A view where updating the image will show certain animations. Current animations include fading
     36  * in and scaling down the new image.
     37  */
     38 public class CrossfadeImageView extends FrameLayout {
     39     // ColorFilters can't currently be modified (b/17262092) so creating a saturation fade with
     40     // color filters would normally require creating a ton of small objects. We get around this by
     41     // caching color filters and limit the saturation to increments of 0.1.
     42     // 0-0.09 -> [0]
     43     // 0.10-0.19 -> [1]
     44     // ...
     45     // 1.0 -> [10]
     46     private final ColorFilter[] mSaturationColorFilters = new ColorFilter[11];
     47     private final ColorMatrix mColorMatrix = new ColorMatrix();
     48     private final ImageView mImageView1;
     49     private final ImageView mImageView2;
     50 
     51     private ImageView mActiveImageView;
     52     private ImageView mInactiveImageView;
     53 
     54     private Bitmap mCurrentBitmap = null;
     55     private Integer mCurrentColor = null;
     56     private Animation mImageInAnimation;
     57     private Animation mImageOutAnimation;
     58 
     59     public CrossfadeImageView(Context context) {
     60         this(context, null);
     61     }
     62 
     63     public CrossfadeImageView(Context context, AttributeSet attrs) {
     64         this(context, attrs, 0);
     65     }
     66 
     67     public CrossfadeImageView(Context context, AttributeSet attrs, int defStyleAttr) {
     68         this(context, attrs, defStyleAttr, 0);
     69     }
     70 
     71     public CrossfadeImageView(Context context, AttributeSet attrs,
     72             int defStyleAttr, int defStyleRes) {
     73         super(context, attrs, defStyleAttr, defStyleRes);
     74         LayoutParams lp = new LayoutParams(
     75                 ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
     76         ImageView imageViewBackground = new ImageView(context, attrs, defStyleAttr, defStyleRes);
     77         imageViewBackground.setLayoutParams(lp);
     78         imageViewBackground.setBackgroundColor(Color.BLACK);
     79         addView(imageViewBackground);
     80         mImageView1 = new ImageView(context, attrs, defStyleAttr, defStyleRes);
     81         mImageView1.setLayoutParams(lp);
     82         addView(mImageView1);
     83         mImageView2 = new ImageView(context, attrs, defStyleAttr, defStyleRes);
     84         mImageView2.setLayoutParams(lp);
     85         addView(mImageView2);
     86 
     87         mActiveImageView = mImageView1;
     88         mInactiveImageView = mImageView2;
     89 
     90         mImageInAnimation = AnimationUtils.loadAnimation(context, R.anim.image_in);
     91         mImageInAnimation.setInterpolator(new LogDecelerateInterpolator(100, 0));
     92         mImageOutAnimation = AnimationUtils.loadAnimation(context, R.anim.image_out);
     93     }
     94 
     95     public void setImageBitmap(Bitmap bitmap, boolean showAnimation) {
     96         if (bitmap != null && bitmap.sameAs(mCurrentBitmap)) {
     97             return;
     98         }
     99         mCurrentBitmap = bitmap;
    100         mCurrentColor = null;
    101         mInactiveImageView.setImageBitmap(bitmap);
    102         if (showAnimation) {
    103             animateViews();
    104         } else {
    105             mActiveImageView.setImageBitmap(bitmap);
    106         }
    107     }
    108 
    109     @Override
    110     public void setBackgroundColor(int color) {
    111         if (mCurrentColor != null && mCurrentColor == color) {
    112             return;
    113         }
    114         mInactiveImageView.setImageBitmap(null);
    115         mCurrentBitmap = null;
    116         mCurrentColor = color;
    117         mInactiveImageView.setBackgroundColor(color);
    118         animateViews();
    119     }
    120 
    121     public void setSaturation(float saturation) {
    122         int i = (int) ((saturation * 100) / 10);
    123         ColorFilter cf = mSaturationColorFilters[i];
    124         if (cf == null) {
    125             mColorMatrix.setSaturation((10 * i) / 100f);
    126             cf = new ColorMatrixColorFilter(mColorMatrix);
    127             mSaturationColorFilters[i] = cf;
    128         }
    129 
    130         mImageView1.setColorFilter(cf);
    131         mImageView2.setColorFilter(cf);
    132     }
    133 
    134     private final Animation.AnimationListener mAnimationListener = new AnimationListenerAdapter() {
    135                 @Override
    136                 public void onAnimationEnd(Animation animation) {
    137                     if (mInactiveImageView != null) {
    138                         mInactiveImageView.setVisibility(View.GONE);
    139                     }
    140                 }
    141             };
    142 
    143     private void animateViews() {
    144         mInactiveImageView.setVisibility(View.VISIBLE);
    145         mInactiveImageView.startAnimation(mImageInAnimation);
    146         mInactiveImageView.bringToFront();
    147         mActiveImageView.startAnimation(mImageOutAnimation);
    148         mImageOutAnimation.setAnimationListener(mAnimationListener);
    149         if (mActiveImageView == mImageView1) {
    150             mActiveImageView = mImageView2;
    151             mInactiveImageView = mImageView1;
    152         } else {
    153             mActiveImageView = mImageView1;
    154             mInactiveImageView = mImageView2;
    155         }
    156     }
    157 }
    158